Slaughtering the Cattle

I am not happy with my crew.  More than once now they have disobeyed me.  First the bag full of wind I told them not to open, but no.  They didn't trust my judgement.  They didn't believe me when I told them not to open it, but they had to try find out.  Now I tell them, by any means, do not kill any cattle.  No exceptions.  And what did my men do?  They went off and killed the cattle.  Eurylochusis really getting on my nerves with all the mischief he has created.  I don't know why i haven't gotten rid of him yet.  I really don't know why...